John, Im glad you brought up the Crank Position Sensor. I work for VW, and everytime a VW has the problem my car is having, it is always the Crank Pos Sensor. Makes a lot of sense. i will go first thing in the morning to have the faults pulled.

What faults am I looking for?

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2001 Mercedes-Benz C320 3.2
1991 Mercedes-Benz 300E 3.0